Portable storage device



FIG. 1 is a front perspective view thereof;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plane view thereof;

FIG. 7 is a bottom plane view thereof; and,

FIG. 8 is a rear perspective view thereof. 

The ornamental design for a portable storage device, as shown and described. 